Diurnal, semidiurmal and quarterdiurnal variations (Cascade waves) are noticed not only in biological systems, but also in environmental conditions like the barometric pressure and tide level changes, etc. Quantitative studies of such variations require special type of harmonic analysis upto the fourth harmonic but excluding the third harmonic. A 32- ordinate scheme is formulated for quick results of such analysis. The scheme is applied in rhythm studies of cell activity in DNA synthesis, as an example. The scheme provides an accurate and lucid means for analysis of cascade waves form time series data.